Chapter10TStormsTornadoes - 1. Stet leaders Chapter 10...

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1. Stet leaders Chapter 10 Thunderstorms and Tornadoes 2. Severe Storms 1. Thunderstorms 2. Tornadoes 3. Hurricanes 3, Atmospheric Hazards and Damages - Floods are most deadly - Flash floods are local floods w/ large volume/short duration May occur anywhere. Controlled by rain volume/intensity, topography, and surface (urban impervious surfaces). Most common in mountainous terrain 4. Cyclone – refers to counter-clockwise circulation around a low pressure center Can be: Tornado Hurricane In other parts of the world a cyclone is the term for hurricane What is a thunderstorm? It may be associated w/ cyclonic activity, but…… Strong up and down air movements Winds are variable and gusty STORM that produces lightning and thunder; usually heavy rains and sometimes hail 5. Thunderstorms Form when warm, humid air rises in unstable area 6. U.S. Thunderstorm Activity (Explain the distribution) Limited in west and north Mostly along the Gulf Coast (70 – 100 days/year) 7. Air Mass Thunderstorms Form in spring/summer Occur from mT air moving north out of Gulf; unstable moist air forms when warm land heats air or it is lifted along front Most occur in mid-afternoon heat Local differences in surface heating = more localized, isolated cells
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8. Stages in Development (air mass t’storms) Cumulus Stage a. Uneven heating leads to cumulus (moves water vapor up) that continue to build and grow vertically b. Cumulonimbus forms fed by supply of moist air. Latent heat allows warm air to rise further (updrafts) c. Cloud passes beyond freezing, the Bergeron effect produces precipitation causing downdrafts and entrainment of cool air 2. Mature Stage (most active: gusty wind, lightning, rain, hail a. Downdraft leaves cloud, precipitation is released b. Cool air can be felt at surface c. Cloud rises to base of stratosphere (spreads into anvil) 3. Dissipating Stage (downdrafts entrain more cool, dry air and rain removes warm moisture = end of cloud) 9. Stages in Development of Air-Mass Thunderstorm
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This note was uploaded on 04/17/2008 for the course GGY 120 taught by Professor Shew during the Spring '08 term at University of North Carolina Wilmington.

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Chapter10TStormsTornadoes - 1. Stet leaders Chapter 10...

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